Die for forming can-bodies



G. W. KNAPP.

DIE FOR FORMING CAN BODIES. No. 888,289.

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ilwrrs gTATES FFICE.

GEORGE W. KNAPP, OF BALTIMORE, MARYLAND.

DIE. FOR FORMING CAN-BCDIES.

SPECIFICATION forming part of Letters Patent No. 388,289, dated August21, 1888.

(No model.)

To all whom it may concern:

Be it known that 1, GEORGE W. KNAPP, a citizen of the United States,residing at Baltimore, in the State of Maryland, have invented certainnew and useful Improvements in Dies for Forming Can-Bodies, of which thefollowing is a specification.

My invention relates to certain dies to b employed in the manufacture ofpreserve-cans, such as are used in hermetically sealing fruits,vegetables, oysters, and other articles.

The object of my invention is to provide dies for turning the ends ofsheet metal canbodies inward and formingonthesaidinwardly-turned part anannular V channel or groove adapted as a seat for the cap,which issoldered thereto.

The invention is illustrated in the acconr panying drawings, in whichFigure 1 is a vertical section of a pair of dies for the first operationon the can-body. The outer vertical black lines represent the canbody.Fig. 2 represents the sectional form of a can-body after it has beensubjected to the treatment of the first pair of dies. Fig. 3 is avertical section of a pair of dies for Operating on the can-body afterit has been subjected to the treatment of the first pair of dies. Fig. 4represents the sectional form of a finished canbody made by the jointaction of the two pairs of dies.

The letter A designates the base part of the first pair of dies, whichis a vertical cylinder of suitable metal, having a bottom flange, a,provided with holes a for securing it. The cylinder has a centralcavity, 1), in its bottom, and a top, 0, with a central opening throughit from the said cavity upward, for a bolt, d, the upper end of whichhas ascrew-thread, d, for connection with a movable die-head, A. Thebolt d connects the said die-head A with the base part A in such way asto allow a vertical movement to the die-head and permit it to be seatedon the base part A and also be lifted above its seat. A spring, E,occupies the cavity 1) in the base part and presses upward against thebolt (1, and thereby keeps the die-head A elevated or lifted from itsseat. A pin,f, is fixed in the top a of the base part, and projectsupward and loosely occupies a hole, f, in the die-head, and prevents thediehead from turning on the bolt (1, but does not interfere with itsvertical movement. The top rim of the diehead A is turned off orrounded, as at g, from the vertical wall to the upper flat surface.

The punch part H of the first pair of dies is above the base part A A,and has on its bottom face a cavity, 71, and a downward rim, j, theinner circumference, g, of which is concaved ,or rounded, and is thecounterpart of the turnedoff top rim, 9, 0f the diehead. A dent orpassage, 71, is in the punch part, and leads to the cavityi and servesas an air-vent.

In operating the first pair of dies, just described, the cylindriccan-body 7a, which in the first instance is straight from top to bottom,is placed on and around the base part A A. (See Fig. 1.) The die'head Amust be so adjusted on its supporting screw-threaded bolt (Z that thetop edge, is, of the can-body will come just below the turned-off toprim, 9, when the die-head is elevated. The punch part H of the die maythen be forced down, and its downward rimj will surround the top edge,7c, of the can-body, and as the die-head A yields the said top edge ofthe can-body will be contracted and take position between the turned offrim 9 of the die-head and the concaved inner circumference, g, of thepunch-rim. When the punch part H of the die is raised, the canbody Itmay be lifted from the base part A, and it will be found that its topend has been contracted or turned inward, as shown in Fig. 2. Thecanbody will then be ready for the treat ment of the second pair ofdies.

A portion of the base part N of the second pair of dies is like thefirst pair, to wit: it is a vertical cylinder, with bottom flange, a,central cavity, 1), and top a, with opening for the bolt (1, a spring,E, in the bottom cavity, and a guide-pin,f. It differs from the firstpair of dies in that it has at its top a cup, 0, the rim p of which isbeveled inward to form one half of the V-channel in the end of the can,and the movable die-head N, which is connected with the base part by thebolt (1, forms the other halfof the said V-channel in the can end. Themovable die-head N fits in and occupies the cup 0 at the top of the basepart, and is kept elevated or lifted from its seat 0' at the cup-bottomby the action of the spring E. It

is provided with a vent-duct, 0 which allows air to escape from the cup.The top rim has a bevel, p, which first serves as a seat to receive thecontracted top edge, is, of the can, when the latter is placed on, (seeFig. 3,) and afterward serves as a seat to form one-half the V-channelin the can end.

The punch part Rof the second pair of dies is above the base part N, andhas on its face a downward rim, 8, which takes around the canbodyk onthe base part N. It also has an annular V-shaped ridge or ring, 25, inthe cavity within the said downward rims. This V-ridge forms the topside of the V-channel w in the can end. A vent-duct, a, relieves thecavity.

In operating the second pair of dies,the canbody having its end kcontracted, must hang on the base part by said top-contracted edgeresting on the bevel p of the movable die head N, which latter iselevated.- The punch part B may then be forced down, and one side of theannular V-ridge i will clamp the contracted top edge, k. of the can onthe bevel p of the movable die-head, and at the same time the downwardrim 3 will take around the can-body below the contracted top and bind itagainst the outer wall of the cup 0. The movable diehead N will yieldand settle down into the cup 0, and when seated therein its bevel willbe coincident or even with the bevel rim p of the cup. and the said twobevels will form the lower side of the V-channel win the can end. Thesheet metal of the can, which is contracted or turned inward, will beforced to take position in the said two bevels p and p, and the annularV-ridge t will form the top side of the channel w in the can-top. Thefinished can-body may then be removed, and will have the appearanceshown in Fig. 4. The bottom as may be secured in any desired way.

A cap, 3/, to fit the annular channel w of the can, is designed to beattached by solder.

Having described my invention, I claim 1. A pair of dies for shaping theends of sheet-metal cans, consisting of the base part N, having at itstop a cup, 0,with an inwardlybeveled rim, and a die-head, N, having abeveled top rim, 1;, and occupying said cup and yieldingverticallytherein, in combination with a punch part, B, having a downward rim, 3,and an annular V-shaped ridge, t, in the cavity within said downwardrim.

2. A pair of dies for shaping the ends of sheet-metal cans, consistingof the base part N, having at its top acup, 0,with an inwardlybeveledrim, a diehead, N, having a beveled top rim, p, and occupying said cup,and a spring to lift the die-head from its seat, in com bination with apunch part, R, havinga down ward rim, 8, and an annular V-shaped ridge,t, in the cavity within said downward rim.

In testimony whereof I affix my signature in the presence of twowitnesses.

GEORGE XV. KNAPP. Witnesses:

J OHN E. MORRIS, JNo. T. MADDoX.

